Spisat Prakticheskuiu Rabotu 2 Po Khimii 9 Klass Gabrielian «90% RELIABLE»

In this step, we use qualitative reactions to confirm the presence of specific ions. Identify the chloride ion ( Cl−cap C l raised to the negative power ) and sulfate ion ( SO42−cap S cap O sub 4 raised to the 2 minus power ) in provided test tubes. Procedure: Add a few drops of silver nitrate ( AgNO3cap A g cap N cap O sub 3 ) to the test tube with HClcap H cap C l Add a few drops of barium chloride ( BaCl2cap B a cap C l sub 2 ) to the test tube with H2SO4cap H sub 2 cap S cap O sub 4 Observations: Reaction 1: A white curdy precipitate forms. Reaction 2: A white finely crystalline precipitate forms. Chemical Equations:

Na2CO3+2HCl→2NaCl+H2O+CO2↑cap N a sub 2 cap C cap O sub 3 plus 2 cap H cap C l right arrow 2 cap N a cap C l plus cap H sub 2 cap O plus cap C cap O sub 2 up arrow Ionic: spisat prakticheskuiu rabotu 2 po khimii 9 klass gabrielian

Cu(OH)2+2H+→Cu2++2H2Ocap C u open paren cap O cap H close paren sub 2 plus 2 cap H raised to the positive power right arrow cap C u raised to the 2 plus power plus 2 cap H sub 2 cap O In this step, we use qualitative reactions to

CuSO4+2NaOH→Cu(OH)2↓+Na2SO4cap C u cap S cap O sub 4 plus 2 cap N a cap O cap H right arrow cap C u open paren cap O cap H close paren sub 2 down arrow positive cap N a sub 2 cap S cap O sub 4 Ionic: Reaction 2: A white finely crystalline precipitate forms

This reaction identifies carbonates through the evolution of gas. Add a few drops of HClcap H cap C l to a solution of sodium carbonate ( Na2CO3cap N a sub 2 cap C cap O sub 3

Cu2++2OH−→Cu(OH)2↓cap C u raised to the 2 plus power plus 2 cap O cap H raised to the negative power right arrow cap C u open paren cap O cap H close paren sub 2 down arrow

Ba2++SO42−→BaSO4↓cap B a raised to the 2 plus power plus cap S cap O sub 4 raised to the 2 minus power right arrow cap B a cap S cap O sub 4 down arrow